My cousin didn't find out she was pregnant until she turned 5 months. Not exactly sure how she didn't know but she drank like a fish until she found out. Her son turned out fine. But she was lucky. I drank at my bachorlette party and then two days later found out I was pregnant. I have a happy healthy almost 4 year old.
I didn't find out until I was 12 weeks or so. And In that three months before the hyperemisis came on I drank... A lot... Kind of picked it up when I was told I couldn't get pregnant. Well... Lots of drunken nights with SO later I'm pregnant. Actually due in a few days. I don't condone it but you didn't know so don't feel guilty. Just don't drink anymore. And my OB say's a glass of red wine after a certain point doesn't hurt it helps BP. etc., I haven't been able to stand alcohol though.
Edit: Left out the important part DD is perfectly healthy. Like I said I don't condone if after you're aware but it didn't hurt my LO.